US1374378A - Lathe - Google Patents

Description

J. E. JOHNSON.

LATHE. APPLICATION EILED lMAY 24, |919.

J. E. JOHNSON.

LATHE.v 'APPLICATION FILED MAY 24. |919.

Patented Apr. 12, 1921.

3 SHEETS-SHEET 2.

WWme/S S; mfp/w54@ J. E. JOHNSON.

LATHE. APPLICATION FILED `IvIAY 24,1919.

m. wm. a E u. ,H/f/ un f 5 A M @e f 0N s s f f ,m 3 f .i, w w M f @lL/O n@ ITI. r. A A ,II f @Wy w1. m .im` A JOHN E. JHNSON, OF ELGLN, LLNGL'S.

LATHE.

i.e-'L-S, Specification of Letters Patent.

Patente-tl Apr. i2, let/Ei.

lpplcaton filed May 24, 1919. Serial No. 299,66.

To allzu/7mm #muy concern.' in the forrn of a dove-tail slidably mountlle it ln'ioufn that l, glenn' E. donnees'. ed between and lzulapted to be guided by citizen oit the United States. residing; in l Ways or groove portions o. in the bed, and gin, in the county et Kane and State et lll1- havingV the usual ineens such as a Aib (i op- 5 nois, have in'v'ented certain new and useful erated by a. collar T on a screw 8, for taking lrnljiroveinents in llathes. of which the 'l'olup Wear and prev'enting unnecessary play. lowing` is a specification. lllhe bed l is supported by and 'tornis an This invention relates to that class ot integral part olf a inain 'trarne 9 which is lathes having a head-stes i and tail-stock. a provided with an upwardly projecting back 'l0 bed, a slide rest or carriage adapted 'to be iranie l0 which is, by preterence in 'the Supported by the bedv and means 'tor supform of a curi'f'ed hollenT traine which exporting and lguiding the tail-stock or tailtends rearward from the main bed of the stoclvy and head-.stock in such a manner es to lathe and upward therefrom to the rear side permit the desired extent oi movement and of an upper track or vertical auxiliary facility ot operation ot the slide-rest ineclialathe bed ll which is rigidly supported in nisrn. position by the baelr traine l0. The back rlho principal object ot the invention is traine il() is inode, by preference, in the to provide a simple, economical. and eiorrn of an outer or Aback web l2, and inner cient lathe. Yiront eurifed web 1? a series oi vertical in- *Other and further objects ot the inveuner ribs A connec'ed with and connecting tion ivillappear trein the olloivingr descripthe inner and outer Webs, and a suitable tion and claims, and from an inspection et number of inner relatively short strengththe accompanying drawings which are infule ening ribs lo, arranged at suitable int-era part. hereof. vals to aiiord the required degree of rllhe invention consists in the J`1'eatures. strength and rigidity.

combinations, arrangement ot arts and de rhe upper track or vertical aturiliary tails oi construction herein oescribed and lat-he bed ll has a fiat liront face which is claimed. perpendicular' to the plane of the top tiet ln the accompanying' drawings, Figure 'l tace of the main or horizontal lat-he bed l. .fio is a plan view oi an improved lathe eonand parallel with respect to the guiding; structed in accordance with my invention; grooves or Ways 5, 5, in the main lathe bed; lF 2 is a vieuY in side or 'front elevation and the upper track ll is located back ot of the lathe sliovvn in Fig. l; and spaced apart rointhe rear edge ol: the Fig. 3 is a detail vieiv o'l the clutch and rnain lathe bed l. so as to leave an ample clutch-operatiiu mechanism7 tor operaunobstructed space above and in front and tively connecting: the slide-restoper11` ingr rear o'f the latter adapted to permit the mechanism with the 'leed screw ineiifhanisrn movement of the slide-rest or tool-earrroge or source ot power, and l'or disconnecting mechanism slidably mounted on the hoi.'n the saine; .'fzontal lathe bed, to any desired position lo Fig'. el is au enlarged vieu' in fl with respect to the headetoolt and tail-steelt vertical Section, taken on line ilwhen the latter are niounted upon or conloolrinp; in the direction indicat. neeted With the track ll. rows7 with parts of the. slide i iii The t 'eelt ll has a bottoni 'tace l and a broken away, to show the inea7 j '1i i top tace l? vvvliich both parallel'ivith re l5 ing' the transversely movable slif'lerest spect t the 'face ol the lathe bed l; mechanism and any tool supported there and the upwardly projecting; 'lianoe l() is by; and attached et its lower extremity to the rear Fig'. i7 is a vieu' in end elevation ot the side of the horizontal lathe bed l or the lathe shown in l? l, 2 and main 'trarne at a point belov.T the level of 50 ln constructing an improved lathe in aethe top face oil the horizontal lathe becl.'tlie cordance with iny invention.y l prov e a upper extremity ot the trarne lO being); at lathe bed` l havingv fiat horizontal carriagetached to the rear side et the top traelf: ll supporting' top su'riliace portions 2. Q upon in sueh a manner as to leave the 'trent face which is slidably mounted a longitu ly 18 the top face 17 and the bottoni tace 1G movable slide rest, or Inain tool-car i; 23 of the track entirely unobstructed. Tle

having the usual bottoni guiding' member upper track ll is thus rigidly supported in Y position with its front face 13 parallel with the ways or guiding grooves 5, 5, in the horizontal bed 1, and with the top face 17 and bottom face 16 parallel with respect to the top face 2 of the horizontal lathe bed.'

A head-stock 19 is slidably mounted in engagement with the top track 11,'and, by preference, supported by the latter in such position that the bottom portion 20 of the head-stock which is located over the lathe bedl is spaced apart with respect to the latter so as to leave an unobstructed space 21 above the lathe bed and between said bedrl and the bottom Vot the head-stock, The head-stock, when constructed as shown in the drawings, has its rear supporting base 22 at its rear side with its rear vertical ilat face 23 in sliding engagement with the front vertical face 18 of the upper track, and the head is provided with a top rearwardly projecting supporting iiange 2li eX- tending over and in sliding engagement with the top face 17 of the track, and a bottom flange 25 which projects rearward beneath and in sliding engagement with the bottom face 16 of the track. And the headstock is secured in fixed relation to the track by means of headed bolts 26 and nuts 27 in threaded engagement with said bolts. (Slee Figs. 2, l and 5.)

The head stock is of course provided with a mandrel 2S, rota-tively mountedin suitable bearings in the head, and adapted to support a face plate 29 and'center point 30 in operative position, and to permit the face plate yandfcenter point to be removed and a chuck or other device to bel mounted upon and operated by the mandrel or hollow shaft. The mandrel or hollow shaft 28 is operatively connected with a suitable source of power, such, for instance, as a belt pulley 31, by means of a main driving shaft 32 rotatively mounted in suitable bearings in the head stock, and a suitable train of gears-not shown-which may be of any ordinary and well known or desired form. The connecting shaft and gear mechanism may include the usual reversing gear mechanism of any suitable known form, and any suitable form of reversing lever 33 'for reversing or changing the gears; and may be provided with the usual clutch mechanism and belt and pulley mechanism Jfor connecting the main driving' shaft with the source of power or disconnecting it therefrom, all of which are familiar to those skilled in the art, in so far as the devicesmentioned are not shown in the drawings or described herein.

A tail-stock 3d, comprises in its construction a rear or side base 35 having an upper rearwardly projecting supporting` flange 36, which extends rearward over and in sliding engagement with the top tace 1'? of the track 11, and having` a bottom iange 37 which extends rearward beneath and in sliding engagement with the bottom edge or face 16 of said track, andhavinga tapered or wedge-shaped gib 38 interposed between the upright rear face of the tail-stock base and the upright front face 18 of the track 11 and in slidingV engagement with the latter, and held in place and adapted to be tightened or loosened, as desired, by means or" an adjusting screw 39 in threaded engagement with the tail-stock and having a collar l0 in engagement with. a recessed or notched portion of the gib, and adapted to enable the latter to be adjusted and secured in any desired adjusted position. The tailstock has the usual dead spindle 41, in which is shown a removable center p0int42; and aV spindle-operating screw 43 and hand wheel 4A; are rotatively mounted in the tail; stock and in operative engagement with the dead-spindle,V for operating the same. The tail stock is provided with securing bolts l5 and nuts i6 in thre ded engagement with .said bolts, the headed ends of the bolts being'mounted in the flanged slot 47 in the track 11, and movable lengthwise oi' the track and said slot to any desired position, torsecuring the tail-stock in any position to which it is mov-ed lengthwise ot' the track 11 and horizontal lathe bed 1. (See Figs. 1, 2 and 5.) The tail-stock has its bottom side or extremity i8 spaced apart from the horizontal top face of the lathe bed 1, and entends over and entirely out orn engagement with said lathebed, so as to provide ample space to permit the tail stock to be moved longitudinally of the lathe bed 1 and track or upright tail-stock supporting member 11 to any desired position with respect to the head-stock, the carriage mechanism, and other parts, and so as to enable the carriage i echanism to be moved longitudinally oi' the lathe bed to any desired extent, and to be moved beneath the tail stock or between it and the lathe bed to the desired extent. Ample space between the tail-stock and the horizontal lathe bed 1 is thus provided to enable the carriage mechanism to be operated automatically or otherwise in an-efi'icient manner and to permit the carriage mechanism and carriageoperating mechanism to move past theV tail vstock in either direction lengthwise of the lathe bed and track, and to belmounted and to operate in the manner herein described and shown.

rllhe main tool carriage or bottom slide rest 3, already described,'is adapted to be moved lengthwise ofthe lathe-bed in either direction between the head-stock and tailstock, and, if desired, beneath the head-stock and tail'stock, or between the head-stock and lathe bed, on the one hand, and between the tail-stock and the lathe bed, on the other hand, with the tail-stock in any desired position, thus enabling the tool or tools carried by the carriagemechanism to be moved llO to the required positions with respect to the work and with respect to the head-stock and tail-stoclz, with facility and in a very efficient and satisfactory manner, when the machine is in operation.

An intermediate slide-rest or transversely movable tool-carriage member a9 is slidably mounted upon and adapted to be moved transversely with respect to the main carriage member or bottom slide rest 3. rllhe bottom rest has an upwardly projecting transverse dove-tail which extends into and in sliding' engagement with a similarly shaped dove-tail slot 5l in .the bottom tace of the intermediate slide-rest Ll5); and the usual tapered gib or tightening; wedge meinn ber 52 is mounted in 'position between one inclined side margin et the dovetail 50 and the adjacent inclined side wall et the l 5l, to take up wear and enable the da. snug` but sliding` fit to be obtained between the parts thus slidably connected. (See Figs. 2, d and A top slideerest or adjustable tool-poste supporting carriage member is adjustably or slidably mounted on the intermediate slide rest al), to which it is adjustably secured in any d esired ordinary and well known manner, so as to enable a tool post or similar device to be supported in any desired position with respect to the slide-rest iai-,9 and with respect to the worll, when4 the device is in operation.

The top slide-rest shown in the drawings, is provided with a dove-tail groove oel in its bottom tace into which extends a similarly shaped dove-tail 55 on the top side ot the intermediate slide-rest t9 already described. The dove-tail 55 and the groove 5st which it slidably engages, are disposed transversely with respect to the lathe bed and at right angles with respect to the longitudinal ways or guidingslots 5 and path of movement of the bottom carriage inember or slide rest 3; and a gib 56 is interposed between one of the inclined sides or". the dove-tail 55 and the adjacent inclined side wall 03": the slot or groove 5d, and may be of any ordinary construction. A front plate 57 is attached to the front side or the top slide-rest 53; and an operating screw 58 is rotatively mounted in a suitable bearing and in engagement with the front plate, and operatively connected with the intermediate slide-rest i9 and the top slide-rest and provided with an operating' cranlr or handle 59, and adapted to enable the top slide-rest to be moved transversely with respect to the lathe bed and over and in sliding` engagement with the intermediate slide rest in one direction, b v the turning of the screw to the right, and in an opposite direction by reversing; the direction of rotation of the screw. rllhe top slide-rest 53 has a {ianged horizontal slot 60 in its upper tace,

the side flanges 6l, 6l on the opposite sides or said slot being adapted to admit a toolpost or similar tool-holding device therebetween, so as to enable the tool post or similar tool-holder to be held in operative position in the slot, and in position to hold the tool in engavement nf'ith the worlr, during` the operation ot the machine. lWhen the top slide-rest has been adjusted to any desired position upon or with respect to the middle or intermediate slide-rest 49 by means of' the screw 58, it is held in such position by the screw; and the top slide rest may be operated by means o'j the screw in the usual manner, while supporting a cutter or other tool in engagement with the work, il oesired. lt is also plain, however, that either the intermediate slide-rest a9, or the bottom slide-rest 3 may be operated1 the intermediate slide-rest transversely of the lathe bed and the bottom rest longitudinally of the bed.

lily improved means for operating the carriage mechanism, and, more particularly, the bottom carriage member or slide rest- 3 and the intermediate slide rest 49, is constructed and adaptedto operate as follows:

A headed bolt 62, having an elongated square or angular head G3 its bottom end is mounted in threaded engagement or anchored in the intermediate slide-rest i9 near the back extremity ot the latter; and the bottom slide-rest or main carriage member 3 has an elongated transverse horizontal slot G in its upper face, and of sutlicient depth and width to permit the angular head G3 of said bolt to move freely in said slot transversely with respect to the bottom slide-rest and lathe bed, as the intermediate slide-rest in which the headed bolt is anchored, is moved backward or forward transversely o'l the lathe bed and bottom slide rest. rEhe bottom slide-rest 3 has a threaded horizontal aperture in its front side which opens into the horizontal slot (la, the arial center of the 'threaded aperture being, by preterence, in alinement with the longitudinal center ol: the horizontal slot 6e? and in the same plane with the center of said slot. si screw GS is mounted in threaded engagement with the threaded aperture 65, and may be provided with a central guidingl pin GT; and a spring 58, which is, by preference in the form of a compressible helical spring, is mounted in' the slot Se between the de pending head ot the bolt 63 and the screwthreaded iliront part of the slotted bottoni slide-rest 3, and, byl preference, between the screw 66 and the bolt head The pin 67 thus serves as guiding' member, to hold the spring' in place in the slot and in such position that the tension et' the spring tends to press the intermediate slide-rest 49 in one direction tansversely with respect 'to the lathe bed and bottom slide rest. The rear endof the spring being` in engagement with l aperture the intermediate slide rest or with the bolt head 68 iiXed to said slide rest7 the direction in which the tension of the spring' tends to move the intermediate slide-rest is rearward. llt is obvious, however, that by a mere reversal of parts, the spring is capable of being used to move the intermediate slide-rest toward the iront instead of in the direction of the back oit' the lathe bed or machine. lt is also plain that the slide rest 49 is adapted to be ted in either direction transversely or the lathe bed by means of an ordinary feed screw, which the threaded in the bottom slide-rest is adapted to receive and engage, and that the inner end of an ordinary lived screw may be rotatively mounted inthe head 68 of the bolt 62 in the ordinary manner.

ln order to provide means tor automatically operating` the carriage mechanism or slide rests in an edicient manner7 the compressible spring 68 is mounted inthe slot 64 and in operative engagement with the bottom slide rest 3 and intermediate sliderest 49 so that the tension ot the springtends to press the intermediate slide in one direction with respect the bottom slide rest, above described, and a slide-operating lever 69 is pivotally mounted upon the bottom slide-rest 3 by means ot' a supporting bracket or clip 70 having upper and lower projecting aws 71 between which the lever extends. said jaws forming a support for a vertical pivot 72 which extends through an aperture in the lever and has its upper and lower ends supported by said jaws. @ne arm of the lever is connected with the intermediate slide-rest 49 by means of a pivot pin 73 which is connected with the intermediate slide-rest by means ot a threaded bolt 74 anchored in the slide rest 49 and having an elongated square Aor angular head 75 which projects forward beyond the trent tace ot said slide-rest 49, to which the bolt is rigidly secured in position to enable the lever to extend below the level ot the bottom tace ot the top slide rest 53. so as to permit the desired freedom of movement of the top rest with respect to the intermediate sliderest 49 and the lever which is thus pivotally connected with said rest 49. See Figs. l, 2, 4, and 5.)

The opposite end of the lever 69 is adapted to` be operatively engaged and guided or operated by a masterpattern 76 which is supported upon the trame of the machine by means or a supporting` bracket 77 secured to the machine trame by means of bolts 78 or other suitable supporting and securing means. (See Figs. l, 2 and 5.) The pattern 7 6 shown in the drawings, is in the form of a strip of metal having a cam or groove.

79 having parallel-opposite side walls 80,

8l7 adapted to admit and operatively engage and guide an anti-friction-roller 82 upon .a depending guiding pin or projection -83 lined to or forming a part of the lever 69. lt is plain that the movement oi' the carriage mechanism in the direction ot the head stock will cause the intermediate slide rest 49 to be moved forward or against the tension ot the compressible spring 68, or in a direction which will cause a tool supported by the top rest to move away from the axis ot rotation ot the work and the center of the mandrel 28 and center point 30, such movement ot the intermediate slide rest being caused by the side wall 8O of the cam slot 79 the roller 82 or projection on the adjacent end ogt the lever 69. lt follows7 of course, that the movement ot the carriage mechanism in an opposite direction or away from the head stock, willwhen the cam slot or pattern is of the shape shown in this instance,-cause the direction ot movement or` the intermediate slide-rest 49 to be toward the center of rotation ot the work or ot the mandrel 28 and center point 30 supported by the head stock, and that these movements of the intermediate and top slide rests will be controlled by and will correspond with the shape or" the guiding; member or pattern whether in the form oi' side walls 80, 8l ot a cam 79 or in any other iesircd suitable form, for guiding or operati ne intermediate slideerest 49 and thereby the top slide-rest and any tool supported thereby in position to engage the work to be operated upon.

My improved means for operating or moving the bottom or main carriage'member 3 lengthwise of the lathe bed in either direction as desired7 is constructed and adapted to operate as follows:

The bottom carriage member or bottom slide rest 3 is provided with a toothed rack xed to the bottom side thereof and extending from end to end of said bottom slide rest 3 in parallel relation to the path ot movement of said rest upon the lathe bed. The rack is, by preference located at or near the longitudinal center of the bottom sliderest andern the lathe bed. A transverse shaft 85 is rotatively mounted in suitable journal bearings 86, 86, in the main frame or lathe bed, and has a toothed pinion 87 lined to said shaft and in toothed engagement with said rack. rlhe shaft is held in place longitudinally by means of collars 88 and 89 fixed to the shaft on opposite sides of the journal bearing 86. A worm wheel 90 is fixed to a hub or sleeve 91 and clutch member 92; andsaid worm wheel, sleeve and clutch member are loosely mounted on the'shatt 85 in such a manner as to permit the worm wheel and its clutch member 92 to rotate while the shaftis not rotating, but disconnected from its source of power.V The shaft is also thus enabled to be rotated by llO hand without regard to the operation or rotation of the worm wheel 90 when the latter is disconnected from the shaft, as will be more fully explained.

A worm or feed screw 93 is fixed to a rotative shaft 91, and in toothed engagement with the worm wheel 90. the shaft 94E being journalcd in suitable bearings in the frame of the machine. The shaft 941 is at right angles to the shaft 85 and has its axis in parallel relation to the path ofmovement of the carriage mechanism. Said shaft 9-1 is connected with a suitable driven part, such, for instance as the shaft or mandrel 28 in the headstock, or other rotative part, adapted to enable the shaft 94k to be rotated in either direction as desired, in any ordi nary and well known manner. 1t is shown in the drawings operatively connected with the shaft or mandrel 28 by means of a sprocket wheel 95 fixed to the shaft or mandrel 28, a sprocket wheel 96 fixed to the shaft 94 and a sprocket chain mounted upon and connecting said sprocket wheels. The sprocket chain is indicated by the numeral 97, and is shown in Figs. 1 and 2.

A clutch member 98 in the form of a sleeve having clutch teeth 99 adapted to be moved into and out of clutching` engagement with clutch teeth 100 on the clutch member 92, is mounted upon and in longitudinally movable relation to the shaft 85 already described. This sleeve clutch member 98 is connected with the shaft 85 by means of a spline or feather 101 fixed to the sleeve clutch member and in sliding engagement with a longitudinal peripheral slot 102 in said shaft. An end washer 103 fixed to the outer end ofthe shaft 85 by means of a screw 104:, or other suitable securing means, serves to hold the sleeveV 98 in operative position upon the shaft, so that said sleeve 98 turns with but is movable longitudinally of the shaft into and out of clutching engagement with the clutch member 91 fixed to the worm wheel 90. A hand wheel 105 having a hub 106 is fixed to and movable with t-he sleeve clutch member 98, and has a handle 107 adapted to enable the sleeve clutch member to be moved into and out of clutching engagement with the clutch member' 92 manually, when desired, and adapted to enable the shaft 95 with its rackengaging pinion 87 fixed to said shaft, to be rotated manually when the shaft 85 is not connected with the worm wheel 90 and worm 93 or with the source of power. r1`he carriage mechanism may thuskbe moved in either direction rapidly and with facility, by hand, whenever desired.

1t is desirable that suitable simple and efficient means lbe provided for automatically disconnecting the shaft 85 from the worm mechanism and source of power when the carriage mechanism has reached a desired predetermined position, or the desiredV limit of its movement when in operation; and also to provide suitable means for disconnecting the shaft 85 from its driving mechanism or source of power by hand, whenever desired. To accomplish this, a lever 1,08 is pivotally mounted in the main frame of the machine by means of a pivot pin 109, and a clutch-operating rod or bar 110, which is, by preference in the form of a flat strip of metal, is pivotally connected at one end with said lever, by means of a pivot 111. The opposite end of said bar 110 has an elongated slot 112 therein which is adapted to slidably engage and encircle the clutch or sleeve member 98 on the shaft 95 in such a manner as to permit the movement of the bar longitudinally of itself and transversely of said sleeve clutch member and shaft encircled thereby. Bosses 113 are fixed to said bar and located on opposite sides of the sleeve clutch member 98, and forni inclined cam or shoulder portions 114, 111i, which are adapted to slidably engage similarly inclined faces 115, 115 on fixed bosses 116, 11G which are fixed to the main frame by means of pins 117, 117, or other securing means. (See Figs. 2, 3 and 4.)

rllhe inner end of the hub 106 of the hand wheel 105 abuts against the outer face 4of the clutch-operating bar 110, so as to permit the bar to move longitudinally in sliding engagement with said hub. 1t is plain that the movement of the bar 110 and hand lever 108 from the position in which they are shown in Fig. 2 in the direction of the head-stock or to the position inV which they are indicated in Fig. 3, will cause the inclined faces 11d, 1141 to slidably engage and be forced outward by the inclined faces 115 on the fixed bosses 116 thus forcing the sleeve clutch member 98 out of clutching engagement with the clutch member 92, as shown in Fig. 3 and also in Fig. 11. And the movement of the lever and said bar 110 in an opposite direction or in the direction of the tail-stock-supporting end of the machine, will permit the hand wheel 105 and its sleeve clutch member 98 to be moved inward by hand or in any desired manner, into clutching engagement with the 'clutch member 92 of the worm wheel mcch anism, whenever desired. Y

The hand lever 108 is operatively connected with. and adapted to be automatically operated by the carriage mechanism, as follows:

A trip or clutcli-iever-operating rod 118 is slidably mounted inbearings 119, in such a manner as to permit the desired limited longitudinal movement of said rod. rEhis rod extends through and in slidable relation to a supporting arm or bracketl 120, fixed to and projecting forward beyond the front side of the bottom slide-rest or main carriage member 3; and an adjustable sleeve maybe mounted in threaded engagement with said arm and 1n sliding engagement with and inA position to encircle the rod 118,A

i fixed thereto in any desired adjusted posi- CJD tion by means of a securing screw 124 which is mounted in the extremities of the split ring and adapted to clampthe ring tightly. upon the rod in any desired adjusted position. y Y

A similar collar or ring 125 is lixed to the rod in such position that the arm 120 and sleeve A121 are located between the collars 123 and 125, and adapted to engage the former when the desired limit of movement ofthe carriage mechanism in one direction has been reached7 thereby operating the lever 108 so as to operate the bar 110 and throw the sleeve clutch member 98 out of clutchinv` engagement with the clutch member 92 or the worm mechanism, thereby disconnecting` the shaft 85 from itssource of power. The further fmovement of the carriage mechanism in the direction of the Vlever 108 is thus prevented.

lt is obvious that 4the movementof the carriage in an opposite direction until the sleeve 121 or arm`120 is brought into operative en gagement with the collar 125 will operate thelever 108 and bar 110in an opposite direction, and move the bar 110 into Vsuch position as to permit the hand wheel and its sleeve clutch member to be 'moved inwardV to position to cause the clutch mechanism to again connect the shaft 85 with the worm mechanism and source of power, when Vdesired.

rThe tail stock has a securing plate 126 yieldingly attached to the upper flange 36 and projecting downward over the rear upper-margin oi the track 11, yielding slidable engagement withl the track by means of headed bolts 127 having conpressible springs 128 interposed between said securing plate and the heads of the securing bolts or pins.

apertures 129 in the webk 13 and 130 in the web 12 are .provided at suitable intervals,'iorV enabling the Vframe to be cleaned,

and may be of any desired iorm.

l V claim: Y Y

1. ln a lathe, the combination with alathe Y bed and extending upward back of the lathe bed, of ,a back Vframe projecting above' the bed ations side, and a track arranged on saidV extension at right angles to the lathe bed, a head-stock mounted imposition to travel over the lathe bed, a tail-stock slidably lcomlected with the vertically exposed lever when the and held in track on the extension and ro'ectin over and spaced from the lathe bed, and a carmovable on said 'lathe bed.

2. in a lathe, the combination oi a horizontal lathe bed, a vertically disposed track spaced apart from and located rearward beyond and above the level of the top of the `lathe bed andin parallel relation to said bed, a head-stock mounted in position to extendrover the lathe bed, a tail-'stock slidably supported by said track and extending over anc spaced apart from the lathe bed, a tooleupporting carriage slidably mounted upon the lathe bed and out of engagement with the track and adapted to be movediinto position to extend between the tail-stock and the lathe bed, and means for operating the tool-supporting carriage.

3Q In a lathe, the combination with lathe bed horizontally disposed, of a back frame projecting thereabove, and vertically positiened track carried by said extension atone side of the lathe bed, and parallel therewith, a tail-stock mounted to extend over the lathe bed and slidably engaging said track, a headstock nmounted on the bed, inrcombination with a bottom slide rest movable longitudinally of the lathe bed, and tool supporting mechanism'supported bysaid slide rest and .adapted to be operated during a movement thereof,

4. 1n a lathe,ithe combination of a lathe bed, a track spaced apart from and located in 'parallel relation to the lathe bed,rsaid track being disposed in a substantially ver-.V

apart from the lathe bed, said tail-stock having along one side outwardly projecting` shoulders cooperating' with the vertical` track, a tool-supporting carriage slidably mounted upon the lathe bed and out of engagement with the track upon which the head-'stock and tail-stockfare supported, and means for operating the tool-supporting carriage. f

5. 1n a lathe, the combinationof a lathe bed, a trackspaced apart-from and located* j rearward beyond and above the level' of the top of theA lathe bed and having top and bottom faces parallel with the top face oi:

the lathe bed. said track having a side face a point below the level of the top of said bed and track and attached to the back of the track, a head-stock `mounted 1n position tending over and spaced apart from the lathe '120 parallel with the longitudinal'center of the ,lathe bed, a tradi-supportingtrame inember fixed to the back of the lathe bed at bed, a head-stock, and-a movable carriage between said head and tail-stocks disposed upon said lathe bed.

14. n a lathe, the combination With a lathe bed, of a back frame carried thereby and having a track disposed in a vertical plane at right angles to the lathe bed, said track being parallel to the lathe bed and having shoulder portions, a tail-stool: ashioned'to Vcooperate with said shoulder portions to support the same above the lathe bed, a head-stoclz, and a movable carriage between said head and tail-stocks disposed upon said lathe bed, said carriage being provided With tool supporting means, mechanism for shifting said supporting means during a movement of the oaiiiage, substantially as described.

Signed at Chicago, Illinois, May 16, 1919.

JOHN E; JOHNSON.

l/Vitnesses HARRY I. CROMER, YV. HARDING.

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